The SME with gravity and explicit diffeomorphism breaking
Robert Bluhm
TL;DR
This paper reviews how the Standard-Model Extension (SME) framework can be used to study gravity theories with explicit diffeomorphism breaking, demonstrating its consistency and usefulness in phenomenological investigations.
Contribution
It shows that the SME remains consistent with Bianchi identities when matter-gravity couplings are included, supporting its application to explicit diffeomorphism breaking in gravity.
Findings
SME maintains consistency with Bianchi identities.
SME provides a useful phenomenological framework.
Supports investigation of explicit diffeomorphism breaking.
Abstract
This overview looks at what happens when the Standard-Model Extension (SME) is used to investigate gravity theories with explicit diffeomorphism breaking. It is shown that when matter-gravity couplings are included, the SME generally maintains consistency with the Bianchi identities, and it therefore provides a useful phenomenological framework for investigating the effects of explicit diffeomorphism breaking in gravity theories.
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